Seiko Cal. 6641 - 440

The 6641-440 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6641 caliber with 32j jewels beating at 21,600 bph, it delivers a 72 hours power reserve. [seikata-wm-7eb6eaf5c43b]

Also known as: Goldfeather, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

14.2mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

32j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1981

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